can anyone tell me what this is?

alexavd(7A)April 16, 2014

Encountered this on the edge of a community pool parking lot (on 4/16/14 in zone 7A). Don't know if it was intentionally planted or if it just naturalized there. It looks like it's getting ready to bloom yellow flowers out of the top. So pretty! Will probably turn out to be some evil invasive thing ha ha. But anyway, just curious what it is...

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missingtheobvious(Blue Ridge 7a)

It's a Mahonia.

I have -- IIRC -- the low Mahonia repens growing wild under an old hedge of Japanese privet. And neighbors have tall Mahonias (shrubs which they prune to keep at 4-5') in their foundation plantings.

I think the one in the photo is not M. repens. (Too many leaflets.)

    Bookmark   April 16, 2014 at 10:38PM
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missingtheobvious(Blue Ridge 7a)

Here's the BONAP page showing which Mahonias are supposed to be growing wild where:

Hopefully one or more of the actual gurus will step in....

[According to BONAP, M. repens doesn't grow wild in NC. So maybe BONAP is out of date, or mine is an escapee, or mine is not M. repens at all.

And BONAP says the only Mahonia which does grow wild in NC is an invasive, M. bealei -- which is too tall and has too many leaflets to be my low Mahonia.

Your photo shows too many leaflets for your Mahonia to be M. bealei.]

The berries on my Mahonia and my neighbors' taller one are a gorgeous bright blue. I think I remember reading that they can be used for making jelly.

Last bit of trivia: they were named in honor of someone named McMahon.

    Bookmark   April 16, 2014 at 11:06PM
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Dang awesome, I've been reading about this ever since you posted your first message. I had no idea where to even start to figure out what it was so thanks a lot. In my reading, it looked like it could be mahonia nervosa common name Oregon Grape - the nervosa I read is the shorter variety. The link you sent to the maps is fantastic - I take it you are in NC (I am in Northern Virginia), and according to the map, mahonia nervosa grows in SC.

OK so I looked at the map page again and saw that, as with NC, the bealei is also the only one that grows wild in Virginia. I google-imaged bealei and the pictures looked identical to my subject plant. I have been looking at mahonias ever since you're post, and the bealei pictures are the only ones that seem to be a perfect fit with my plant. One of the strongest similarities is the unusual form, the other mahonias didn't seem to have that distinctive form.

I'm curious why you think the leaves don't look like bealei.

And like I said before, with my luck, it WOULD be an invasive plant, ha ha ha!

This is awesome - I love learning about new plants!

    Bookmark   April 16, 2014 at 11:21PM
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B. aquifolium is what most people out here know as (Tall) Oregon Grape, the state flower of Oregon. B. nervosa is commonly seen in the woods, and is sometimes referred to as Oregon Grape.

Both have edible berries--tart when first blue, getting sweeter when over-ripe and shriveling, like a raisin. The tall variety spreads over time to form thickets.

    Bookmark   April 16, 2014 at 11:32PM
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missingtheobvious(Blue Ridge 7a)

alexavd, thanks for your enthusiasm. I've always thought Mahonia is a great plant -- even when I was calling it "that weird holly under the privets." Then one day I saw a photo on a website of NC plant photos and recognized it as my "weird holly."

Why I say yours isn't M. bealei: When I look at your left-hand photo, the leaf which points to 5 o'clock has at least 15 leaflets (I'm not sure if there are additional, smaller leaflets near the trunk). Though it looks like a branch with 15 leaves, that "branch" is actually all one leaf. That type of leaf is called a "compound leaf," and the individual smaller parts are known as "leaflets."

Here's NCSU's page on M. bealei:
It says "Foliage: Alternate, compound pinnate, leathery dark green to blue-green leaves; 1-2 feet long; 9-13 leaflets with 5-7 spines on each."

So M. bealei has a maximum of 13 leaflets: too few leaflets to be your Mahonia.

Here's an explanation of leaves and leaflets (examples are from the pea family):

Other examples of compound leaves include: clover; roses; walnut and ash trees; tomatoes; and poison ivy, oak, and sumac.

This post was edited by missingtheobvious on Thu, Apr 17, 14 at 0:36

    Bookmark   April 17, 2014 at 12:33AM
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There do exist some hybrids, one is called M x intermedia ( or x media, but I think that got mangled by nurseries)
That has up to 21 leaflets.

@ missingtheobvious: do you think it could be possible that there are M bealei-cultivars on the market that are not just selected from the species but got hybridized at some point? And still are just labeled as straight M bealei? I really need to count some leaflets of plants near here, whether they fit.

    Bookmark   April 17, 2014 at 1:30AM
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missingtheobvious(Blue Ridge 7a)

linaria, I can't help you on that. I didn't even know there were hybrids until you mentioned it. I think I've seen a tall Mahonia at a nursery, but I doubt I looked at the tag. Certainly there are many, many plants sold under the wrong name, if not multiple wrong names!

I only know the genus because one of them (possibly M. repens) happens to grow under my privet hedge, and I accidentally found a photo of it online when I was looking for another shrub (which grows under the neighbor's monster Leyland cypress hedge farther east along the property line -- possibly leechbrush, Nestronia umbellula, but I won't know till I see it bloom, and I keep forgetting to look!). Then I saw the taller Mahonia in my neighbor's foundation bed -- and later at another neighbor's house.

    Bookmark   April 17, 2014 at 2:13AM
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floral_uk z.8/9 SW UK

The leaves look insufficiently toothed for M nervosa and it definitely isn't M aquifolium. I'd lean towards the japonica/bealei direction. Invasive in many states.

Here is a link that might be useful: Mahonia bealei

    Bookmark   April 17, 2014 at 3:56AM
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jekeesl (south-central Arkansas)(7b)

That looks like M. bealei to me, with those heavy spines and thick-looking leaves. The plants are variable, with heights ranging from 20 inches to more than 12 feet tall and lateral leaflets with 4 to 10 pairs. More details on that species are available in the Flora of China key below.

Here is a link that might be useful: Flora of China

    Bookmark   April 17, 2014 at 6:44AM
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Dave in NoVA • 7a • Northern VA

There are some M. bealei growing in our woods. I would not classify them as necessarily invasive here. Only see them occasionally. I think they're cool and the deer don't seem to bother them.

    Bookmark   April 17, 2014 at 7:53AM
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